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A method for producing titanium dioxide by the non-blast furnace titanium slag sulfuric acid method of self-circulation of waste acid

A non-blast furnace, sulfuric acid method technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of low pretreatment titanium slag, low comprehensive utilization rate of titanium resources, and difficulty in comprehensive recovery, so as to improve the recovery rate and solve the problem of The Effects of Disposal and Recycling Difficulties

Active Publication Date: 2018-12-14
TAIHE IRON MINE CHONGQING IRON & STEEL GROUP MINING +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for producing titanium white by the sulfuric acid method of non-blast furnace titanium slag self-circulating waste acid, aiming at the low comprehensive utilization rate of existing titanium resources in the development and utilization of vanadium-titanium magnetite Titanium dioxide waste acid is difficult to economically recycle, and the comprehensive recovery of vanadium, gallium and scandium in the production process of titanium dioxide is difficult. Using vanadium-titanium magnetite non-blast furnace titanium slag as raw material, the non-blast furnace titanium slag is treated with waste acid from the titanium dioxide production process. Pretreatment to obtain pretreated titanium slag with low aluminum and magnesium content, and then use concentrated sulfuric acid to acidify and mature the pretreated titanium slag, and then produce titanium dioxide through water immersion, concentration, hydrolysis, roasting and other processes

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  • A method for producing titanium dioxide by the non-blast furnace titanium slag sulfuric acid method of self-circulation of waste acid

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Experimental program
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Effect test

Embodiment 1

[0038] Firstly, grind and dry the titanium slag whose particle size is less than 74 μm, and account for 90% of the titanium slag. According to the solid-to-liquid ratio of 1:5kg / L, the concentration of titanium white waste acid is 25%, and it is stirred and pretreated at 90°C for 5 hours. Add the pretreated slag obtained by pressure filtration of the leached ore pulp into an acidolysis tank filled with concentrated sulfuric acid for acidolysis reaction. The moisture content of the pretreated slag is 15%, the acid-mineral ratio of the acidolysis process is 1.8, and the sulfuric acid concentration is 98%. , the acid hydrolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured and then matured. The curing temperature is 200° C. and the curing time is 2 hours. After the aging is completed, water is added in proportion to the aged acidolysis tank for leaching, and finally filtered to obtain titanium liquid. The titanium liquid is concentrat...

Embodiment 2

[0040] Firstly, 90% of the titanium slag with a particle size below 45 μm is ground and dried, and the solid-to-liquid ratio is 1:5 kg / L, and the concentration of titanium white waste acid is 20%, and it is stirred and pretreated at 95°C for 6 hours. Add the pretreated slag obtained after the leached ore pulp is press-filtered into an acidolysis tank filled with concentrated sulfuric acid for acidolysis reaction. The moisture content of the pretreated slag is 10%, the acid-mineral ratio of the acidolysis process is 1.7, and the sulfuric acid concentration is 98. %, the acid hydrolysis temperature is 190°C. After the acid hydrolysis reaction is completed, the slurry is solidified and then aged. The aging temperature is 220°C, and the aging holding time is 3 hours. After the aging is completed, water is added in proportion to the aged acidolysis tank for leaching, and finally filtered to obtain titanium liquid. The titanium liquid is concentrated and hydrolyzed, and the obtaine...

Embodiment 3

[0042] Firstly, grind and dry the titanium slag whose particle size is less than 45 μm, and account for 90% of the titanium slag. According to the solid-to-liquid ratio of 1:5kg / L, the concentration of titanium dioxide waste acid is 16%, and it is stirred and pretreated at 85°C for 8 hours. Add the pretreated slag obtained after the leached ore pulp is press-filtered into an acidolysis tank filled with concentrated sulfuric acid for acidolysis reaction. The moisture content of the pretreated slag is 18%, the acid-mineral ratio of the acidolysis process is 1.9, and the sulfuric acid concentration is 98. %, the acid hydrolysis temperature is 200°C. After the acid hydrolysis reaction is completed, the slurry is solidified and then aged. The aging temperature is 200°C, and the aging holding time is 3 hours. After the aging is completed, water is added in proportion to the aged acidolysis tank for leaching, and finally filtered to obtain titanium liquid. The titanium liquid is con...

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Abstract

The invention discloses a waste acid self circulation sulfuric acid method of producing titanium dioxide from non-blast furnace titanium slag, and belongs to the technical field of titanium dioxide production. According to the method, titanium slag generated in non-blast furnace smelting of vanadium-titanium magnetite is taken as the raw material, the waste acids generated during the titanium dioxide production process and non-blast furnace titanium slag are mixed to obtain preprocessed titanium slag with low contents of iron, aluminum, and magnesium, the preprocessed titanium slag is decomposed and aged by concentrated sulfuric acid and then subjected to water soaking, concentration, hydrolysis, and burning to produce titanium dioxide, and after hydrolysis, the waste acids are returned and reused in circulation. The method is characterized in that waste acids generated in titanium dioxide production are used to preprocess titanium slag to remove most aluminum and magnesium impurities in titanium slag; the influence of the aluminum and magnesium impurities on the titanium dioxide production is eliminated, the technical process of the titanium iron ore sulfuric acid method is simplified, high quality titanium dioxide is produced, the waste acids generated in titanium dioxide hydrolysis can be directly recovered and reused, and the environmental problem caused by high concentration acidic wastewater in titanium dioxide industry is solved.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and relates to a method for producing titanium dioxide by using non-blast furnace titanium slag and self-circulating utilization of titanium dioxide waste acid, in particular to the direct utilization of titanium dioxide waste acid and vanadium-titanium magnetite or ilmenite concentrate A method for producing titanium dioxide by reducing slag. Background technique [0002] my country is very rich in titanium resources, the reserves of which rank first in the world, among which, the reserves of titanium resources in the Panxi region account for more than 90% of the country's total, mainly including the four major mining areas of Panzhihua, Baima, Taihe and Hongge. However, there are congenital deficiencies in the types of titanium ore reserves in my country. Most of them are commensal and associated ores, and there is no single ore. The vanadium-titanium magnetite in the Panxi ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/053
Inventor 蒋训雄龚明斌赵磊杨发均王爱平满先云王政陶治其林江顺吴丰祥汪胜东刘卫昆蒋伟陈钢
Owner TAIHE IRON MINE CHONGQING IRON & STEEL GROUP MINING
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